A blistering heatwave that has been scorching much of eastern Australia is set to transition into stormy weather later this week.
As the intense heat ebbs, conditions are expected to bring the “perfect ingredients” for thunderstorms, raising the potential for heavy rainfall and even flash floods.
Severe Heatwave Grips New South Wales and Queensland
On Tuesday, temperatures soared into the high 30s across much of western Sydney, with Penrith recording a searing 39.7°C – nearly 12°C above the November average.
Similar temperatures were predicted for Wednesday.
Sydney’s city center saw a slightly cooler 28.2°C on Tuesday, but by Wednesday, the forecasted high was 34°C, the hottest day since February.
The prolonged heatwave, which has affected New South Wales (NSW) and Queensland, is expected to continue into Thursday, straining power supplies as residents turn to air conditioning.
Despite a forecasted reduction in the risk of blackouts, the Australian Energy Market Operator (AEMO) predicted that wholesale power prices could soar to $17,500 per megawatt hour on Tuesday evening.
Thunderstorms are expected to bring heavy rain and flash floods after the heatwave subsides.Unplanned maintenance of coal-fired plants and weak wind conditions are expected to limit renewable energy generation, contributing to a tight electricity supply.
Thunderstorms and Flash Flood Risks After the Heat
The end of the heatwave will bring a shift in weather patterns.
A low-pressure system over South Australia combined with a trough over eastern NSW will bring tropical moisture, setting the stage for thunderstorms.
According to Weatherzone senior meteorologist Ben Domensino, the arrival of an upper-level low will create conditions ripe for volatile storms.
“Once the heat is flushed out, we’re looking at a few days of rain and thunderstorms,” he said.
The thunderstorms, which are expected to last through the week, could bring substantial rainfall.
Sydney may experience up to 25mm of rain by Saturday, along with the risk of flash flooding.
The transition from hot to wet weather could cause notable impacts, including disruptions and localized flooding.